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ARCNET® Network Analyzer 


■ Low cost network analyzer 

■ Simple to use and understand 

■ Rugged compact handheld 

■ ARCNET compatible 

■ Extensive diagnostic capability 

■ Easy to read backlit LCD 

■ Optional remote PC display 

■ Directly supports coaxial star or 
coaxial bus cabling 

■ Carrying case for convenient 

■ Transparent operation to the 
network under test 

■ Ideal for field troubleshooting 


Plant floor troubleshooting 
Desktop network analysis 
Product development 
Network management 

Analyzing ARCNET networks is simplified with the ARC DETECT network analyzer. 



Control Systems, Inc. 

The ARC DETECT offers 
sophisticated ARCNET network 
analysis in a compact, handheld unit 
and is a valuable tool in maintaining 
an ARCNET LAN. The operator can 
determine which devices are 
connected to the network, the content 
of messages being sent, who caused a 
reconfiguration, and network 
performance. Using a backlit LCD 
display, the operator can scroll 
through the analyzer's data buffer in 
order to study network traffic. 

ARC DETECT consists of a handheld 
terminal with a 40 key membrane 
keyboard along with a 4 line by 20 
character LCD display. A 
microprocessor and ARCNET 
communications controller are 
dedicated to capturing and storing the 
ARCNET traffic present on the 
network. Power is derived from a 
wall-mounted UL approved 
transformer. ARC DETECT is 
available in two models. The first 
model is for star networks which 
include active or passive hubs. The 
second model is directed towards bus 
or hubless systems although 

connection to an active hub is also 

ARC DETECT is transparent to the 
network under test since it never joins 
the network (never participates in the 
token pass) yet it can examine all 
other nodes on the network. Since it 
can examine all nodes, complete 
traffic on the network can be analyzed 
including the content of packets. 
Using a unique filter option, only 
selected messages can be acquired 
allowing the operator to key on a 
particular event of significance. 
Because ARC DETECT is a real-time 
device, token rotation time can be 
displayed and other events can be 
time stamped as they occur. 

An optional Windows-based PC 
program ARCDETECT-PC allows the 
ARC DETECT network analyzer to 
communicate to a Windows-based PC 
via the COM 1 port on the PC and the 
built-in-serial port on the ARC 
DETECT. Network traffic can then 
be displayed on a larger, more 
colorful monitor. 


Networking and Control Systems for Industry 

Ten Diagnostic Functions 


ARC DETECT offers the operator an 
on-line help mode for each of the 
function keys. Simply depressing the 
"help" key, followed by the desired 
function key, will yield information 
about that function to be displayed on 
the screen. Help can be accessed at 
any time. 

NET MAP - Network Map 

All active node addresses on the 
network are displayed. An active 
node is one that participates in the 
token pass. Nodes that are added to 
the network are identified with a (+) 
sign beside the address. Similarly, as 
a node leaves the network a (-) sign 
is appended to the address. Nodes 
that leave and enter networks may be 
the result of communication problems 
that degrade system performance. 
These problems are extremely 
difficult to detect but, ARC DETECT 
provides the clue, 

RECON - Reconfiguration 

A reconfiguration occurs when a 
node enters a network by first 
generating a reconfiguration burst 
that disrupts the normal token passing 
sequence. Although an inherent 
feature of ARCNET, excessive 
reconfigurations could be a result of a 
marginal network. ARC DETECT 
counts reconfigurations and displays 
the changes in the network map after 
a reconfiguration occurs. 

TOKEN TIME - Token Rotation 

The time it takes for any one node to 
pass the token and receive it again is 
called the token rotation time. ARC 
DETECT determines the actual token 
time and displays the result 
continuously. The maximum token 
rotation time is also displayed 
thereby indicting the worst-case 
response of the network. Token 
rotation time is an indication of the 
realtime performance of the network. 

LOAD FACTOR - Network 

Network performance can be 
measured using three parameters: 

packets/sec, bytes/sec and bits/sec. 
All three are displayed dynamically 
with the maximum amount stored and 
displayed along with the current value. 

Displayed in ASCII 

The contents of the acquired packets 
are displayed in ASCII format. 
ASCII control characters that cannot 
be displayed are represented by a (.). 
Displayed with the data are the source 
node address, destination node 
address, and packet size in either 
hexadecimal or decimal form 
depending upon the HEX/DEC 

PACKET HEX - Packets Displayed 
in Hexadecimal 

The contents of the acquired packets 
are displayed in hexadecimal format. 
Also displayed with the data are the 
source node address, destination node 
address, and packet size in either 
hexadecimal or decimal form 
depending upon the HEX/DEC 

PACKET COUNT - Packet Count 

ARC DETECT counts the number of 
packets transmitted or received by 
each node. Messages are comprised 
of packets and by knowing the 
amount of packets sent, the operator 
can determine which nodes are 
creating the most network traffic. 

PACKET SIZE - Packet Size 

ARCNET allows for variable length 
packets and ARC DETECT records 
the minimum and maximum length 
packets sent from each node. This 
information is handy in determining if 
network traffic is occurring as 
expected. The average length packet 
is displayed as an indication of 

SET FILTER - Set Capture Parame- 

In order to avoid the acquisition of 
superfluous data, data can be filtered 
based upon capture parameters 
selected by the operator. When this 
mode is selected, various parameters 
are displayed with an "XXX" 
designation alongside. By changing 

the designations to desired values, 
only that data that corresponds to the 
designated parameters will be 
acquired. A particular parameter is 
ignored if the designation field is left 
as an "XXX." Parameters that can be 
assigned and their ranges are as 

Parameters Symbol Range 
Source node 

address SID 1-255 

Destination node 

address DID 0-255 

Packet size CNT 1-508 

Buffer offset BUFOFF 1-508 

Data VALUE 00-FF (hex) 

Parameter values can be entered in 
either hexadecimal or decimal form 
depending upon the mode selected. 

For example, to view all broadcast 
messages, set the DID to and only 
broadcast messages will be captured. 
By setting the SID to 255 and DID to 
0, only those broadcast messages 
from node 255 (decimal) will be 
captured. Other capture constraints 
are possible using this very flexible 

Fl, F2, F3 - User Functions 

Three function keys have been 
reserved for future features or for 
special tests. Contact factory with 
any special requirements. 

Five Indicators 

There are five LED indicators that 
depict ARC DETECT's modes of 

MODE - located above SNAP Shot 

Indicates that a single event 
acquisition is taking place. 

MODE - located above CONT UP- 

Indicates that the unit is continuously 
acquiring data. 

BASE - located above HEX/DEC 

Indicates that ARC DETECT is in 
hexadecimal mode. 

TIME - located above ABS/DELTA 

Indicates that the absolute mode has 
been selected. 

ERROR - located above CON- 

Indicates an error has occured. 

Five Modes of Operation 

SNAP SHOT - Single Event 

When this mode is selected, ARC 
DETECT immediately acquires data 
for the function selected. Once the 
data changes for any reason, 
acquisition stops; however, the 
display will indicate the changed data. 
This mode is useful when the operator 
desires to capture a single event. 
Depressing the mode button again 
results in another event being 
captured. This mode is applicable to 
NET MAP and RECON functions. 

CONT UPDATE - Continuous 

In this mode, data is continuously 
acquired until this mode is exited. 
This is the normal operating mode 
where the display is continuously 
updated with the acquired data. 
Depressing this mode button suspends 
acquisition so that the operator can 
analyze the readings. Depressing the 
mode button again resumes 

HEX/DEC - Number Conversion - 

Node addresses and set filter 
parameters can be displayed in either 
decimal or hexadecimal form. Each 
representation can be alternated by 
simply toggling this mode key. 

ABS/DELTA - Absolute or Relative 
Time Stamp 

When packets are being monitored, 
their reception is time stamped 
relative to the beginning of 
acquisition. This is called the 
absolute (ABS) mode. If it is desired 
to display the time between packets, 
the relative (DELTA) mode is 

selected. Each representation is 
displayed by simply toggling this 
mode key. 

CONFIG SETUP - Configuration 
and Setup 

Depressing the configuration key 
allows the operator to view ARC 

DETECT' s current configuration. 
Newer ARCNET technology allows 
for variable network speeds and ARC 
DETECT can be configured for 
different baud rates. Available baud 
rates are 2.5 Mbps, 1.25 Mbps, 625 
Kbps, 312.5 Kbps, and 156.25 Kbps. 


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Connecting ARC DETECT to a Network 

ARC DETECT is available in two 
models: ARCDETECT-CXS and 
version is for coaxial star applications 
where field connections are made to 
an unused port on either a passive or 
active hub. Simply connect the 10' 
coaxial cable (included with the unit) 
to a port on the hub. On passive hubs 
remove the terminator attached to the 
unused port before connecting 

The -CXB version is primarily 
intended for hubless systems, 
although it can function with active 
hubs. Connect a BNC "T" connector 
and terminator (included with the 
unit) to the top of the ARC DETECT. 
Remove the terminator at one end of 
the bus segment and connect a 10' 
coaxial cable between the ARC 
DETECT and the port where the 

terminator was removed. ARC 
DETECT can also be inserted in the 
middle of a bus segment but without 
the terminator. The -CXB version 
can still be used with an active hub. 
Using the BNC "T" connector and 
terminator, connect the 10' coaxial 
cable to an unused coaxial port on the 
hub. The -CXB version is not 
recommended for use with passive 

Active hubs such as CCSFs MOD 
HUB and MODHUBp/us are required 
for monitoring networks with either 
twisted-pair, long-haul twisted-pair, 
fiber optic or broadband segments. 
Simply connect either an ARCDE- 
an unused coaxial baseband port 
following the rules stated above. 

Connection Diagram 


For hubless systems, connect the ARCDETECT-CXB to either end of the bus segment along with a terminator. No terminator 
is used for connection within the segment. 


7' long with molded plug 
0-40°C operating 

Case is ABS. Plastic display window and 
keypad overlay are a polyester-polycarbonate 

40 key embossed legend over steel snap 

4 line x 20 characters backlit supertwist LCD 
Grayhound 3501 

ARCNET via BNC (-CXB model has a 
white BNC housing; -CXS model has a metal 
BNC housing) 

Power via Switchcraft #712A jack 
Serial port via RJ- 1 1 

Carrying Case 



Charcoal gray textured case with latches, 
handle, and inside foam protection 



High density polyethylene 

Agency Approval: 


4"Hx 15.5"Wx 13.31"D 

Handheld Unit 


Shipping Carton 


4 l/2"Hx 15.75"Wxl4.25"D 

Shipping Weight: 

6 lbs. 


Power Supply 



Wall-mount plug-in, 2 prong 

Case color: 


2.95"Hx 2.72"Wx 1.93"D 



Impact resistant black thermoplastic 


Input 105-129 VAC 60Hz 0.15A 
Output +5VDC 0.5A 

Agency Approval: FCC Part 15 Class A 

Ordering Information 

Included with the ARC DETECT are a wall-mount power supply, 10' RG-62/u coaxial cable, BNC "T" connector and 
93 ohm terminator. Included with the ARCDETECT-CXS are the 10' coaxial cable and power supply. Included with the 
ARCDETECT-PC, which is distributed on a 3.5" diskette, is a 10' long serial port cable. Order by the following numbers: 






Control Systems, Inc. 


Trad* AMooUtion 

2512 Wisconsin Avenue • Downers Grove, Illinois 60515 • USA 
TEL 708.963.7070 FAX 708.963.0109 

ARCNET is a registered irademarlt of Datapoint Corporation. ARC Control and ARC 
DETECT are trademarks of Contemporary Control Systems, Inc. Other product names 
may be trademarks or registered trademarks of their respective companies. Specifications 
are subject to change without notice. © Copyright Contemporary Control Systems, Inc. 
April 1994 TD876000-0DA